📊 Strategy Evidence Charts

Students complete a structured investigation chart using matched 2-digit by 2-digit and 4-digit by 1-digit problems solved with area models, partial products, and the standard algorithm. They record total, number of written steps, where regrouping appears, and one note about clarity or efficiency for each method. The teacher briefly models how to turn raw solution data into a simple bar graph or tally table so students can compare methods fairly before making claims.